> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GPT-5.

> GPT-5.4 and GPT-5.4-Pro are now available. Note: Pro version is expensive — use with caution. Not available for free-tier users.

**2026/3/6 11:05 (UTC+8)** · New Model · OpenAI

GPT-5.4 and GPT-5.4-Pro are now available. Note: Pro version is expensive — use with caution. Not available for free-tier users.

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